Displaying 20 results from an estimated 1000 matches similar to: "points on a sphere"
2009 Oct 22
2
Diffusion of particles inside a sphere
Hello veryone,
I am interested in the diffusion of particles inside a sphere, and its release through a small pore on the sphere surface. Unfortunately, I have not found the way to do this in R. Could you help me?
Thank very much in advance for your help
2012 Oct 01
1
Points on a Sphere -- How to visualize them?
Dear All,
I need to do something simple: I have a set of points which are located on
the surface of a sphere (let's say the centre of the sphere is in (0,0,0)
and the sphere has radius R=1).
How can I visualize them?
I am looking for something like this
http://bit.ly/PnSerU
with the addition of some spots that represent some points I want to plot
on the sphere surface.
Any suggestion
2009 May 29
1
labels in rgl.sphere
Dear R list
I am using rgl.sphere to visualize scatter plot data in three
dimensional space.
Thanks to the rgl library, I can easily find out the data point that I
am interested in.
However, as I can not see the labels of each data point directly in
RGL window,
I usually look for the values of x, y, z axis to find out the label
(or line number of the data point).
Is there any way that I
2011 Feb 25
2
Visualizing Points on a Sphere
Dear All,
I need to plot some points on the surface of a sphere, but I am not sure
about how to proceed to achieve this in R (or if it is suitable for this
at all).
In any case, I am not looking for really fancy visualizations; for
instance you can consider the images between formulae 5 and 6 at
http://bit.ly/hOgK9h
Any suggestion is appreciated.
Cheers
Lorenzo
2012 Oct 05
2
Test for Random Points on a Sphere
Dear All,
I implemented an algorithm for (uniform) random rotations.
In order to test it, I can apply it to a unit vector (0,0,1) in Cartesian
coordinates.
The result is supposed to be a set of random, uniformly distributed,
points on a sphere (not the point of the algorithm, but a way to test it).
This is what the points look like when I plot them, but other then
eyeballing them, can anyone
2003 Dec 25
6
Plot a sphere
Hi,
I'm new to R (and math ;) Would somebody please be so kind as to direct me
in plotting a 3D sphere?
I tried something in the lines of:
####
y <- x <- seq(-pi, pi, length=pi*10)
f <- function(x,y)
{
z <- sqrt(pi - x^2 - y^2)
#z[is.na(z)] <- 0
z
}
z <- outer(x, y, f)
persp(x, y, z, theta = 120, phi = 30)
####
I've also tried: .... make.surface.grid(...) ..
2012 Oct 01
6
nlme: spatial autocorrelation on a sphere
I have spatial data on a sphere (the Earth) for which I would like to run an gls model assuming that the errors are autcorrelated, i.e. including a corSpatial correlation in the model specification.
In this case the distance metric should be calculated on the sphere, therefore metric = "euclidean" in (for example) corSpher would be incorrect.
I would be grateful for help on how to
2007 Nov 27
1
voronoi/Delaunay/Dirichlet tessellation on sphere in R or S?
There's Renka's STRIPACK, and TRIPACK, respectively, ACM TOMS Algorithms
772 and 751, and there's the R package "deldir" which does the Delaunay
for a plane, but does anyone have or know of the tessellation in R for a
sphere?
Also, is there a standard indexing scheme for Delaunay facets, and
perhaps of edges in such facets? I'd expect that to be a publication
reference,
2010 Nov 09
2
Help with Iterator
Dear Experts,
The following is my "Iterator". When I try to write a new function with
itel, I got error.
This is what I have:
> supDist<-function(x,y) return(max(abs(x-y)))
>
> myIterator <- function(xinit,f,data=NULL,eps=1e-6,itmax=5,verbose=FALSE) {
+ xold<-xinit
+ itel<-0
+ repeat {
+ xnew<-f(xold,data)
+ if (verbose) {
+ cat(
+
2005 Mar 25
7
What is web login password for Asteirsk@Home
2007 Aug 02
6
Teliax Quality of Service
Asterisk Users,
I recently ran into some problems with the quality of service with Teliax.
This occurred on August 1, 2007 with a dropped outbound call, audio
quality isse on the callee side- not hearing me well on callee side, and
sending DTMF tones (configured for RFC2833). Am I the only Teliax customer
having this problem?
It seems like when I am ready to go live with my Asterisk
2002 Dec 08
1
color of plot axes involving POSIX types
I am attempting to plot frequency of occurrence against (calendar) time. As
the output is to be produced as a Powerpoint picture on a dark background I
wish to make the plot output yellow
> par(col="yellow", col.axis="yellow", col.lab="yellow", col.main="yellow")
> plot(t2, t1, ylim=c(0,40), main="Episynlestes run 2",
2002 Jul 22
2
finding the colour at a point
I think this was asked recently but I can't find the item.
Is it possible to find the colour at a point on a graphics page?
I want to estimate the area of a complex shape by colouring it then random
sampling from an enclosing box ...
Richard Rowe
Richard Rowe
Senior Lecturer
Department of Zoology and Tropical Ecology, James Cook University
Townsville, Queensland 4811, Australia
fax (61)7
2007 Mar 19
0
Problem to logar in MMORPG Sphere
Galera I go direct to the subject. I negotiate it I am the following
one, I costumava to play a certain called MMORPG Sphere (
http://www.spherebr.com.br/ or http://www.uox.com.br/ ). It happens
that I installed the game for the Wine without no problem and until
the window of loguin of the game it appears equal in windows. But in
the hour of logar my account, it appears Connecting
2012 Apr 12
2
scatter3d: problem with spheres-color
Dear List,
I don't get scatter3d to color the sheres according to the '|' argument.
library(car)
scatter3d(prestige ~ income + education|type, data=Prestige)
The spheres on my screen are all colored the same and they are not
conditional on Prestige$type.
On the other hand: Fit3d and Ellipse3d are colored according to the
group argument.
rgl_0.92.879
car_2.0-12
R version 2.15.0
2017 Oct 25
2
not healing one file
Hi Gluster Gurus,
I'm using a gluster volume as home for our users. The volume is
replica 3, running on CentOS 7, gluster version 3.10
(3.10.6-1.el7.x86_64). Clients are running Fedora 26 and also
gluster 3.10 (3.10.6-3.fc26.x86_64).
During the data backup I got an I/O error on one file. Manually
checking for this file on a client confirms this:
ls -l
2000 Oct 03
1
strings
I am attempting to analyse some behaviour sequence data. The input is an
alphabetic string "ASDFGH ... ". I wish to start at one end of the string,
peel off each character, and convert to an integer to develop transition
matrices etc. My blundering through the ref manual hasn't produced any light.
Can this be done easily in R or should I pre-process?
I recollect an item
2002 May 16
3
Wind rose plots?
Just out of curiosity, has anyone created wind roses using R?
Thanks.
Tosh
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2008 Feb 03
1
distances between points in R^3
Dear R helpers,
I'm trying to write a numerical scheme for a boundary integral method
to solve an electromagnetic problem. This requires the computation of
the distance between points at the surface of an object (a sphere, in
my example). Here is my code,
> require(rgl)
> r<-1
> size<-10
> theta<-seq(0,2*pi,length=size*2)
> phi<-seq(0,pi,length=size)
> pc
2002 May 11
2
RODBC sqlFetch
Hi,
Thanks for showing me how to use RODBC and odbcConnect.
Now works nicely. The question I've got now is:
noms <- list.files(pattern=".DBF")
# removing extension names:
noms <- sapply(noms, function(x) as.character(strsplit(x,".DBF")) ,
USE.NAMES=F)
for (i in 1:length(noms)) {
s <- sqlFetch(bdades, noms[i])
# etc.
}
But it seems that sqlFetch()